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移动信道是一种典型突发信道,它具有的快衰落效应是它区别于其它固定通信信道的显著标志之一。为克服快衰落效应造成的长突发误码,对这种信道必须利用纠错编码的方法,进行差错控制系统的设计. 信道的模化是设计差错控制系统,提高可靠性的第一步。本文从一个实际移动信道的现场试验曲线k出发,提出了一个建立在简单分群Markov模型基础上,表示移动信道四状态Markov模型;并用非线性最小二乘拟合法,求出此模型的解析表达式,同时计算出模型的概率、转移矩阵P,并与三状态进行比较。P矩阵的得到,为移动信道中纠错方案的选择提供了重要依据。
Mobile channel is a typical burst channel, which has a fast fading effect is its distinguishing it from other fixed communication channel, one of the notable signs. In order to overcome the long burst error caused by the fast fading effect, the error control system must be designed by using error correction coding.The channel modeling is the first step to design an error control system and improve the reliability. Based on the field test curve k of an actual mobile channel, this paper proposes a four-state Markov model based on the simple Markov model and the non-linear least square method. The analytical expression of this model is obtained , While calculating the probability of the model, transfer matrix P, and compared with the three states. P matrix obtained, for the mobile channel error correction program provides an important basis for the choice.